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/*
* Copyright (C) 2001, 2002, 2003 Philip Blundell <philb@gnu.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <X11/Xatom.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#ifdef ENABLE_NLS
#include <libintl.h>
#include <locale.h>
#endif
static GSList *widgets;
static gboolean filter_installed;
static GdkAtom locale_atom;
static void
remove_widget (GObject *o)
{
widgets = g_slist_remove (widgets, o);
}
static GdkFilterReturn
filter (GdkXEvent *xevp, GdkEvent *ev, gpointer p)
{
XEvent *xev = (XEvent *)xevp;
if (xev->type == PropertyNotify)
{
GdkDisplay *gdisplay;
Atom atom;
gdisplay = gdk_x11_lookup_xdisplay (xev->xany.display);
atom = gdk_x11_atom_to_xatom_for_display (gdisplay, locale_atom);
if (xev->xproperty.atom == atom)
{
Atom actual_type;
int actual_format;
unsigned long actual_length;
unsigned long bytes_after;
unsigned char *prop = NULL;
if (XGetWindowProperty (xev->xany.display, xev->xany.window,
atom, 0, 65536, False, XA_STRING,
&actual_type, &actual_format,
&actual_length, &bytes_after, (unsigned char **)&prop) == Success
&& actual_length > 0
&& actual_type == XA_STRING)
{
GSList *iter;
#ifdef ENABLE_NLS
setlocale (LC_MESSAGES, (const char *)prop);
#endif
for (iter = widgets; iter; iter = iter->next)
{
GtkWidget *w = GTK_WIDGET (iter->data);
void (*func)(GtkWidget *, void *) = g_object_get_data (G_OBJECT (w),
"translate-callback");
gpointer data = g_object_get_data (G_OBJECT (w), "translate-callback-data");
if (func)
func (w, data);
}
}
if (prop)
XFree (prop);
return TRUE;
}
}
return FALSE;
}
#ifdef ENABLE_NLS
static void
label_translation (GtkWidget *w, void *pointer)
{
gchar *domain = g_object_get_data (G_OBJECT (w), "translate-domain");
gchar *string = g_object_get_data (G_OBJECT (w), "translate-string");
gtk_label_set_text (GTK_LABEL (w), dgettext (domain, string));
}
#endif
/**
* gtk_widget_add_translation_hook:
* @w: A widget.
* @func: A callback function.
* @data: Passed as the second argument when the callback is invoked.
*
* Register a callback to be invoked when the current locale changes.
*/
void
gtk_widget_add_translation_hook (GtkWidget *w, void (*func)(GtkWidget *, void *), gpointer data)
{
widgets = g_slist_append (widgets, w);
g_signal_connect (G_OBJECT (w), "destroy", G_CALLBACK (remove_widget), NULL);
g_object_set_data (G_OBJECT (w), "translate-callback", func);
g_object_set_data (G_OBJECT (w), "translate-callback-data", data);
if (! filter_installed)
{
Display *dpy = GDK_DISPLAY ();
XSelectInput (dpy, RootWindow (dpy, DefaultScreen (dpy)),
PropertyChangeMask);
locale_atom = gdk_atom_intern ("_GPE_LOCALE", FALSE);
gdk_window_add_filter (GDK_ROOT_PARENT (), filter, NULL);
filter_installed = TRUE;
}
func (w, data);
}
/**
* gtk_label_new_with_translation:
* @domain: Textual domain used for this program.
* @string: Message string to be displayed.
* @Returns: a GtkWidget
*
* Creates a translation-aware label widget. The supplied string is
* passed through gettext prior to display, and automatically updated
* if the selected locale is changed.
*/
GtkWidget *
gtk_label_new_with_translation (gchar *domain, gchar *string)
{
#ifdef ENABLE_NLS
gchar *initial_value = dgettext (domain, string);
GtkWidget *w = gtk_label_new (initial_value);
g_object_set_data (G_OBJECT (w), "translate-domain", domain);
g_object_set_data (G_OBJECT (w), "translate-string", string);
gtk_widget_add_translation_hook (w, label_translation, NULL);
#else
GtkWidget *w = gtk_label_new (string);
#endif
return w;
}
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